Enhancement of outgrowth of EB virus‐transformed cells from normal human peripheral blood by a tumor promoter, TPA

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Abstract
Effect of 12‐O‐tetradecanoyl‐phorbol‐13‐acetate (TPA) on the establishment of lymphoblastoid cell lines (LCL) following spontaneous transformation of B cells by Epstein‐Barr virus (EBV) from peripheral lymphocytes of healthy EBV‐seropositive adults was examined. In the lymphocyte culture with TPA (0.5 ng/ml), the frequency of establishment of LCL increased and the time required for appearance of transformation decreased. A larger number of EBV‐positive cells in the peripheral blood were detected in the assay by co‐cultures with cord blood lymphocytes in the presence of TPA than in the absence of it. The enhancement of LCL establishment by TPA was largely abolished in the culture with EBV neutralizing antibody‐containing human umbilical cord serum. This suggests that the enhancement by TPA may be caused mostly by transformation of coresident B lymphocytes infected with active virus induced from the EBV genome‐positive cells by TPA.